When word circulated that some of Lost’s finale was filmed in Los Angeles, rumors spread quickly that season four may bring even more mainland filming. The studio, producers, actors, and probably the guys who sweep the floors are all locked down in radio silence at this point, so the rumors have been free to thrive.

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There is, as you have probably guessed, a lot of conjecture backing this rumor. It hinges almost entirely on the idea that the majority of the character break-aways will flash forwards. In fact, it has already been confirmed to some degree – by aintitcoolnews – that Lost's fourth season will come equipped with a compliment of both flash forwards and flash backs.

Aside from this, we know that only two main characters, Kate (Evangeline Lilly) and Jack (Matthew Fox) are in Los Angeles in the flash forwards and the need for specific locations isn’t usually an issue for Lost’s crew. In the past, locations in Hawaii have stood in convincingly for Australia, Korea, New York City, and virtually any other local required by the script including a snowy city street.

Even in the case of “Through the Looking Glass,” which featured scenes shot on the 6th streeet bridge in LA, many of the exterior shots, including the ones outside of the funeral home, were shot in Hawaii. Various other scenes from Jack’s flash forward were filmed on the sets of Grey’s Anatomy, and stock sound stage locations.

When the Lost cast and producers come out of Radio Silence at the San Diego Comic Con later this month, there should be a stronger indication as to whether or not the crew will be spending any time filming on the mainland. At this point though, the rumors are looking pretty weak.